* CodeMemberPropertyTest.cs: Test for default value of Type property.

* CodeMemberPropertyTest.cs: Test for default value of Type property.
* CodeGeneratorFromCompileUnitTest.cs: Removed last usage of Assertion class.
* CodeGeneratorFromTypeTest.cs: Added tests for method, property and
parameter level attributes.
* CodeMemberProperty.cs: Default value of Type is empty CodeTypeReference.
* System_test.dll.sources: Added CodeMemberPropertyTest.cs from System.CodeDom.
* VBCodeGenerator.cs: Fixed generated code for method, property and parameter
level attributes. Fixed code generated for FieldDirection.

svn path=/trunk/mcs/; revision=46516